Author
Topic: blowing oil out of breather. (Read 1596 times)

Have had this problem of late and can only pin it down to Enfields being very cold blooded. On my 2011 G5 when the temp is 40f or below oil is blown from the rh side case through the breather into the airfilter-box and exits through a vent in the front bottom edge of the airfilter-box. When it is warmer weather it all stays inside where it's 'sposed to be. Should I be changing to a slightly thinner oil in the "winter" (this is California we don't get a real winter) , say 15-40?

thanks for the input. Had the breather hose on my Ducati's all the way back and into a small plastic bottle with a vent. Never actually got any oil in the bottle though, but left it in place just in case (just don't like the idea of lubricated tyres). Always ran Castrol GTX 20-50 in the Ducati-s year round , but they ran much , much hotter than the Enfield which is why I wondered if a slightly lower weight oil might be the way to go. I run a K&N air-filter which does not catch much additional oil.

I have extended the breather pipe of my 2010 G5 Deluxe up over the rear fender, & ended it right at the lower rear edge of the fender. I have noticed it has nocturnal emissions from this tube & keep a pie plate under it in the garage. When I got the bike there was oil in the breather box & in the air filter. I plugged the hole in my air box & used a long hose for the breather,old school style. Although blowing out is oil annoying, it is no more annoying than my many attempts to get my oil level correct, which I suspect to be the cause of the emissions. It is the only aspect of the EFI engine that I give poor marks. It should have been designed to have a definite visible correct oil level in its sump when at rest-like others, Ducati, BMW, etc. At least excess oil has an escape route, & none gets on my tire or air filter.

You guys could always do what the older bikes did: order the duckbill and let it exit right over the chain. http://nfieldgear.com/enfield-store/duckbill-breather-hose.htmlThen the excess oil goes to the chain and the duckbill prevents sucking dust into the crankcase. I would still run the breather line up to the level of the seat and then back down to limit how much blowby you get.

I don't have a problem with the oil level sight gage working and I also don't have a problem with oil blowing out of the engine on my 2011 G5.

It's been run at 1200 feet elevation up to over 8000 feet elevation at speeds ranging from 40 mph constant to over 65 mph constant for over 8,500 miles and no crankcase oil leaks (if I ignore the slight weeping that was coming from the front rocker cover that a little Ultra-Black fixed).

Well decided that easiest way to solve this was to run a 5 foot length of breather hose from the case over the frame to the other side and loop it back down into the airbox fitting. Result , no more oil loss. Figured it would just run back into the case.

Well decided that easiest way to solve this was to run a 5 foot length of breather hose from the case over the frame to the other side and loop it back down into the airbox fitting. Result , no more oil loss. Figured it would just run back into the case.

Some newer bikes have a 'labyrinth' off the breather to deflect any blow out and let it drip back. Same principle.